[56.12] Zonal Flows from the MDI Medium-l Data

J. Schou (Stanford)

The small scale zonal flows in the outer part of the solar
convection zone were recently detected by Kosovichev &
Schou (1997) using f-mode frequency splittings. Results from
five 72 day time-series (Schou et al. 1998) showed a slight
drift of the pattern towards the equator in a manner similar
to that seen in the so-called torsional oscillation observed
using surface Doppler shift measurements. Here I describe
results using several 72 day time-series of MDI Medium-l
data. These results show a clear drift of the pattern
towards the equator and that the near surface polar rotation
rate appears to change with time.

This research is supported by the SOI-MDI NASA grant
NAG5-3077 at Stanford University.

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